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nyquist responce theory useless Condenser Microphones
Old 1st June 2006
Gear Maniac
rush's Avatar

Originally Posted by dkatz42
Just to be precise, you can't filter out jitter (if you could, life would be fine indeed and we could all use cheap clocks.) You're referring to harmonics above the Nyquist frequency, which reflect back across that frequency (so at 48KHz sampling, a 30 KHz component would show up at 18KHz, or worse, a 45KHz component would show up at 3 KHz.) This aliasing can be used on purpose if you want to do frequency translation (say, a DSP-based radio tuner.)
Reading through your post again .. I think we're both on the same page .. and I think you're right using the word jitter in this sense .. I should have been a bit more careful in my wording as it could cause some confusion.
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